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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840cea444c251b1302b81fa81f185c4124438d96772e4be5fb65b6c3af85e3e8' 
  AND token = 'ac2DoB1+gN22jguZTUn36CvkrcbBk9/nbQooXArophU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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