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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f188c94a287bec6b9de0e90a99a790d20d55b2158155c8a1e39720199811f124' 
  AND token = 'J6LuE3x/NVJQCJGZUUOtWTyYXBJLlGVcRW3xC2JXPbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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