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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9399ac05871c6f47503690bc2aea06a93fb96b17164a6e15121874dacc5d580' 
  AND token = 'dx8e+887UgP4H1v/F1AOp+LmCQj9LBvOEMs/5BhdqL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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