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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94df336152487d6bd3664d1e417d3b71c9f47c2b164cfd86efb54ae31627b51a' 
  AND token = 'nNn5ydQZB6XjkX8Feu684QGolIITg57LI8fvfOL/3bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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