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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5a0c7cb0c787991d1ce0612359928de95b83fc30f871f6beea90d2046aac46' 
  AND token = 'aevtTWWXVb6Zz71vpiO25Ia3IiKx2xPK6+A512K57fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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