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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c39e7b95ad7ef4acc03df498dc33be1b5cebbe75cd816aa8a7e77a6ba495a59a' 
  AND token = 'Imt0ZctGq/A+wdHdCNOXg9C3MGhMhASwxxCWWEumwQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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