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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea26b4f6ef1a2c2b5c0e3dd58133f7df405ce9b1a46005fc3b8e2b10cc09df62' 
  AND token = 'wvHPBglYdyR5ZiX8fOV0jcfUnNyHKWap/krk3eaItys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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