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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf543b34444514f4b115cf80558beebfcd0f4d9bd4b0ce9d1c8d74cd48c6d25' 
  AND token = 'lc/ZigDQ/tDbRglqugj31d8FP09124D+uoStltKKvQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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