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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2871ad1fabe81265f573e5b1fb1545f35b59b99e698a857daa32cd28c22271c' 
  AND token = 'dAjQFeZ0+z9z73CwJyfxe4zMYE889CUahU2/3CfxPIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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