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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a68b0d8e34e33e4e2d80826444c0c8f2ede5b065c4bb20922d0cc1ec775ec89' 
  AND token = 'XSRG5VPpOnCVqxNijIiBT94mTjF74UyZVSOIwmcG+Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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