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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '245153dce30b6f42b4dc50bb5366e62efb3e46d77e8fb65611f3df7fa813612e' 
  AND token = 'PenH/WBwZ/LNEYS/k1Z0j5ILgjKqdQJDU1Vl6TIQCkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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