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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd025cf6abe8bbd39bd9a3a0f7ac7eb3d3e21b4a39d356c865233015209a9744' 
  AND token = '1Lg6ZdF1kba7atsmHe8JpLbwzWOPc6wELhRRiJsXwa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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