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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fe683f7213f7f2b6e116c8ffc25ae95f3b996565d6320a770533f4e3c52044' 
  AND token = 'k4Y246DUg+HoUQC2Gf0PwQPzTx70gCzknYbc9j5HokY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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