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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f619861c520d67e9b425235426aaacb2924c3d6dda8cb29a09d8cd5cbe4ec4c' 
  AND token = 'crVTTZT+xlt7gXiR/dCPTg3RKaBXvHK7+22UQZI93oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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