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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6344d0f452acdd6558fe0a75b68ef72f7b6d48236e7069e077f6158fb3ea363' 
  AND token = 'MQo4PNytNIc6CgvbNwjCF23mlin4oTGv3uqbt4fWpA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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