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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e9fce33fbd2b6cae049d13c6a003c5270b437042743792eb22cd266bbc6967' 
  AND token = 'd93wSRurNTKUsCgsncbNdGvi4vcSfnLMZfdCegXzmAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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