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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '948391860aec86fd9ac16148b303231e4c61136188079335a2ebe490d67a048e' 
  AND token = 'UzzcyOJ5y0FlYyA5apum3ReVVlT0i4XPAuBTfZdoMsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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