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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f569f35f9df05e9ff187b2e25312541c6e461627ec230a0164317b7f136e1d52' 
  AND token = 'kChj7a0SzEMn6yu/ZqEZcLRZEZmQ8LtXz0Yw8F9YcOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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