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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa3033fb003efa6d221de685d88d4409a998b8e956515712f9c368381e30d1ad' 
  AND token = 'VcJeuwTtdm8rHESRR0fKPuGFpP/m4p2I/2eOmg4EQ7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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