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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36fe686105f20f4dfcdb5c74db09159344204af1bfb5b44d3f757f81b5141fd0' 
  AND token = 'rKOmZsBxc9H2J2UrhOMPna/DP84/248wWsUw03suX5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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