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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b867319ea34be6f68ac9311093b130d6c5702dcd2d03d9ec3e3ba2affe77dab4' 
  AND token = '4t/0A5pOAmcjmyGyMg3eACWaFbPAG0pxrP3C/eCrWE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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