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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4afa83432a72e9a59b0b891ae3f5fa7a813c9f1d1b8f99a1af831a4026a06b09' 
  AND token = 'XPNYERq3r4JqN99NdJ9xK6euq1pf7WGhIjpjd1w8xa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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