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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c5fcc624f5e27daa4599e58235060c297a48df510ce2729a139b35ebc371f7' 
  AND token = 'pXqQFa+DDu6YZRN5ZNLxTkSxfLuXflS/rWd9tY6SR+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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