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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03976b2de78241aa718a0131a965111186f584b3883a2beec2b81eb355a19e59' 
  AND token = '40yDae0A9gq81SvGfXqxmm7FE+sHjJZfgTW6e01rvzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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