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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2548bbe36c318c07c61ac68c80ba3afc667953779b3304e5d6d292266e40b5' 
  AND token = 'Ur61MYTE/67dam8/g8KsqO3r8H4XLbsTv0qTaX2xHzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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