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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf7375321e6aad8364733d075971ad10ac830e43cb3718afeb7aec526c5ce85' 
  AND token = 'k5msjxIH72gvNMpn+1+s49PEXUxTvzdrRIjIAl4KMc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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