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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bba5c52044aed928812d4ba031b35c266f3e750aa09035921d0beac814e5248' 
  AND token = 'ymBL8V01BF8c+cGYEAzJKsxh4BMz+YD3zI/bW0mOfyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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