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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c036c9894485fd2c48809ddfc44d865659952f848b071b78783afd8fd8f5fe9' 
  AND token = '9gL+5J1/VeowOs1OoFCkFjp393uzEP4YrlTyqgj+5dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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