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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e998a2e6d25bb3df0afa8490588e534ac8ecab7ba72d8378911403d0cd4b25a' 
  AND token = 'FteDNsVmjKmZ4MRm6LFzoPXuWQagopguC8wC795zL34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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