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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b150c3b942767e3013ddc52de770fe6d94a45c5ad93ded9a3b20ea9661a234ae' 
  AND token = 'uWvf9Oc7b3VNL1UdxHLA6Ph2WfMK+Z1kagnuEQobB+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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