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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee90a5a75e7cfcdc124fb8b8d80ec5370375e356ea5c702ad8901b42ceb72cfc' 
  AND token = 'T0KhDbj2+q+Wpmp8e/kJBGk5eEN9JptRhCjSXsM1QO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}