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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0715e19a37326b4ef8b7a1ec210883d6641d595b3a74e736904a6a5f4baf767' 
  AND token = '1O9nDXezxKMn9sprJSQ+CrooqDkF4Jvz9TE3+2OfP14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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