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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86873eee6e6a4dd46b6e9b90d148014b946ab628a16978edb67528ba071870a' 
  AND token = 'u9aiiQua4KFtw/4xWk8Q7RiDevPZxrdF+Jk/Rd8m/to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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