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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f20029c66cb30002dfeb6c250fdbee54398374e9fe5491e8995a1f047b095ba' 
  AND token = 'W8TNwq+Zv2Vx1QqbNE1c2C6w96GnibncIbaFQ2naVqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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