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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956b5249c19db6c181656cc9da799d32dc0c2ad5e1cc9d822a54949285f0a608' 
  AND token = 'Cutxy0PUeMIFTkVTc/n62XR5bl1HKhxD2oAGT7ryFXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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