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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7694f4fbad6ef3bd6e6f754cfbbf7549f3c875ba2a99c172c770f45c5804532d' 
  AND token = 'q4hfj+QUugm0JI1UIWgxcfTieCDd6REGq5NuHYBMl0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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