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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d90a9aacd27f633221a1ed4ef08f16905f4216b8520eb5f7930ba51d047107' 
  AND token = 'ZEeJA8eVq82v9Zutg9CgXTnf+OCZfG/aOpWpq5UsrPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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