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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922edacf5243849d58d1abeb2ba7c56666c35bac07f975a39e0c36565b8ab705' 
  AND token = 'DGehorgDG/0x9MEV/97NIxbWood4zPW8ydNe6AGFREg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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