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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d9002d6a3c48d5cdf79a3f69809f3660bd7819d9e6b69eb68a4ad145d8a2b6b' 
  AND token = '589Ci8z5EqkvGZGj7JNs0fHi1DBKV+HlGcUol99EuDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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