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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952b2d4699faed741d9266161db63cee5ff5c3f17e8a2b36c33df76ffe80d38a' 
  AND token = 'l8cC5GlixaZ9W4+8HW+IA0P490G6N3rkwSBHCiWFOS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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