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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418fc5c2b43b2cfa5ae8cd139ef2a6896c1bfee6a720ee2d2049ff12990f58b5' 
  AND token = 'Durr7XxaW+Z+mPQW7Yk1bz1fNZ76R8D6pLVQslNVygM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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