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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c9bb3ca985f5e35e495098f5c5b822c999f10b2060fba96c21d584ed1e3f25' 
  AND token = '3fhswk7obv6zrK48RHh6nxcAxXv0nzdjtgvRq5Z8AgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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