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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bb223581362d9e0c514c45f3db0671caf93b9443b5a94babca3713995afb4e' 
  AND token = 'EDLgxN5IqsAu8l7m10gu8AW8Huvrmnd3/9J6ybElIc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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