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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab4b545bde764e0a599fef9fb2662f970ff105452b5d4f9e0b8b44d21432237' 
  AND token = 'zSeL8VW3RpSGtRJKarcbJUpNAgvbwGVWTPf0aLEIbxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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