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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0525b2c1bc090d1ef3bcf953e43233b13ce8e593ad731244e61ba7a0412156f6' 
  AND token = 'tjVSpeD3AY+a4d8o93nl/wUCmxhjlwj4Ww1srIa3als=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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