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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c5396317aff73a0082a6fc2a794fb17a8c2c714e4ad65a9c35e037bae68f26b' 
  AND token = 'xIK3Tdjjs4VCDOD3c7Kd8Dfi0zvcIgeZkKkrIL7RP78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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