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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2b0a31374dc9fca99368fb004de93b35f7b8de9b5ba898ad5a3f01232c34401' 
  AND token = 'YfT2DPaaAJm6AGfF4KXYnSvK1NKs/PUgNAnPO65bWqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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