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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f2f15720e555c38ca371bd80382093448c4a6e53388b99d7c37580e448b255f' 
  AND token = 'lkrdkqadFRGi4fwaJ4yP+EowMaEDJodfhah87kyChpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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