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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4db6678defe060b8c2dd419db16fb66aeea73e444428fce87a4a4ea7773695' 
  AND token = 'oJP7jFJiM8D4dIX0x5lj9vUEiH71s0llAZnpw6x1Kp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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