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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cc808de3a0fecfa29193eb0786d08726a35455b38f69d0ca9ba8e2a7d99ef70' 
  AND token = 'JqUIFYwr11BbnhzxGtHxfOMWFnv2O+JWBycFKd02m3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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