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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c9a831e309f2caf98ecc8503c3ac0dd23856e5000eb156eb201de273f5bece' 
  AND token = 'iBQAfRKKBd3psNfK8xrJsg0EXd8QOchH3Iayr31Bx8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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